Funny, back in the early 80's an Electrical Automation class I attended did just that on the first day there was a box with a red button that said (DO NOT PRESS.)
However, there was a hole in the middle and if fully depressed would allow the head of a pin to come thru and then a capacitor of unknown value would discharge.QUOTE]
I have just got to make one of those. I thought of making a dummy bomb with a count down timer but that is just so much better. Anyone any idea what would be a safe voltage and capacitance?
Mike.